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Troubleshooting Main Components
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Checking the Valves
Compare valve operation to the output signal of the control board.
Oil Return Solenoid Valve
1. The oil return solenoid valve is located at the bottom of the accumulator. The oil return solenoid valve will start operating after the com-
pressor has been operating for a certain period. This operation transfers oil stored at the bottom of the accumulator into the compressor.
2. After the compressor starts operating, the oil return solenoid valve will be on for two (2) minutes. Check for operation noise and piping
vibration on the oil return solenoid valve.
3. The oil return solenoid valve will also turn on after the compressor stops operating.
4. The oil return solenoid valve will turn on and off repeatedly due to cycle operation. This is normal and does not indicate that the outdoor
unit is malfunctioning.
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500V]).
Partial Defrost Solenoid Valve
1. Defrost operation helps eliminate ice that has accumulated on the heat exchanger, recovering its performance.
2. When the system is in partial defrost operation, two (2) solenoid valves will turn on and off in sequence for six (6) minutes.
3. The partial solenoid valves will turn off after partial defrost operation has ended.
• Partial solenoid valve operation change can be checked by comparing the before and after temperatures of the bypass piping.
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ter [DC 500V]).
Supercooled Bypass Valve
1. When the compressor starts to operate, it opens the supercooled bypass valve for about one (1) minute (the supercooled bypass valve is
on).
2. To reduce the high/low-pressure difference. The supercooled bypass will open (turn on) five (5) seconds after the compressor stops to
reduce the high / low pressure difference in the system.
3. If the compressor suction pipe temperature drops below a certain temperature, the supercooled bypass valve opens (turns on).
4. The supercooled bypass valve will open or close based on suction piping temperature. This is normal and does not indicate the outdoor
unit is malfunctioning.
5. Changes of solenoid valve operation can be verified by measuring bypass outlet piping temperature, detecting refrigerant sound, etc.
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[DC 500V]).
CHECKING THE VALVES
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